fix: Parallelize GetTxs #5934

Job	Run time
branch_name	4s
lint / yamllint	11s
lint / golangci-lint	1m 12s
lint / goreleaser-check	12s
lint / markdown-lint	1m 2s
proto / buf-check	7s
test / Run Unit Tests	3m 16s
test / Run EVM Execution Tests	3m 22s
test / Go Mod Tidy Check	26s
test / Build All Rollkit Binaries	2m 6s
test / Run E2E System Tests	3m 24s
lint / hadolint / hadolint	6s
release	0s
	15m 28s

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